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Nano Research 2020, 13(6): 1733-1738 https://doi.org/10.1007/s12274-020-2799-4
Research Article | Issue | Published: 24 April 2020

Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2

Show Author's Information Meizhuang Liu§,  Changwei Wu§,  Zizhao Liu,  Zhiqiang Wang,  Dao-Xin Yao( ),  Dingyong Zhong( )
School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China

§ Meizhuang Liu and Changwei Wu contributed equally to this work.

Keywords:
scanning tunneling microscopy, transition-metal dichalcogenides, charge density wave, 1T-VTe2
Topics:
Density functional theoryElectronic structureFerromagnetismMonolayersScanning tunneling microscopyTellurium compoundsVanadium
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Liu M, Wu C, Liu Z, et al. Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2. Nano Research, 2020, 13(6): 1733-1738. https://doi.org/10.1007/s12274-020-2799-4
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Abstract Full text Electronic supplementary material About this article

Vanadium dichalcogenides have attracted increasing interests for the charge density wave phenomena and possible ferromagnetism. Here, we report on the multiphase behavior and gap opening in monolayer VTe2 grown by molecular beam epitaxy. Scanning tunneling microscopy (STM) and spectroscopy study revealed the (4×4) metallic and gapped (2 3 ×2 3 ) charge-density wave (CDW) phases with an energy gap of ~ 40 meV. Through the in-plane condensation of vanadium atoms, the typical star-of-David clusters and truncated triangle-shaped clusters are formed in the (4×4) and (2 3 ×2 3 ) phases respectively, resulting in different surface morphologies and electronic structures as confirmed by density functional theory (DFT) calculations with on-site Coulomb repulsion. The CDW-driven reorganization of the atomic structure weakens the ferromagnetic superexchange coupling and strengthens the antiferromagnetic exchange coupling on the contrary, suppressing the long-range magnetic order in monolayer VTe2. The electron correlation is found to be important to explain the gap opening in the (2 3 ×2 3 ) phase.


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About this article

Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2

Show Author's information Meizhuang Liu§, Changwei Wu§, Zizhao Liu, Zhiqiang Wang, Dao-Xin Yao( ), Dingyong Zhong( )
School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China

§ Meizhuang Liu and Changwei Wu contributed equally to this work.

Abstract

Vanadium dichalcogenides have attracted increasing interests for the charge density wave phenomena and possible ferromagnetism. Here, we report on the multiphase behavior and gap opening in monolayer VTe2 grown by molecular beam epitaxy. Scanning tunneling microscopy (STM) and spectroscopy study revealed the (4×4) metallic and gapped (2 3 ×2 3 ) charge-density wave (CDW) phases with an energy gap of ~ 40 meV. Through the in-plane condensation of vanadium atoms, the typical star-of-David clusters and truncated triangle-shaped clusters are formed in the (4×4) and (2 3 ×2 3 ) phases respectively, resulting in different surface morphologies and electronic structures as confirmed by density functional theory (DFT) calculations with on-site Coulomb repulsion. The CDW-driven reorganization of the atomic structure weakens the ferromagnetic superexchange coupling and strengthens the antiferromagnetic exchange coupling on the contrary, suppressing the long-range magnetic order in monolayer VTe2. The electron correlation is found to be important to explain the gap opening in the (2 3 ×2 3 ) phase.

Keywords: scanning tunneling microscopy, transition-metal dichalcogenides, charge density wave, 1T-VTe2

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Publication history
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Acknowledgements

Publication history

Received: 23 December 2019
Revised: 23 March 2020
Accepted: 07 April 2020
Published: 24 April 2020
Issue date: June 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

D. Y. Z. thanks the financial support from the National Natural Science Foundation Program of China (Nos. 11974431 and 11832019) and the Guangzhou Science and Technology Project (No. 201707020002). C. W. W. and D. X. Y. thank the support from the National Key Research and Development Program of China (Nos. 2017YFA0206203 and 2018YFA0306001), the National Natural Science Foundation Program of China (No. 11974432), Guangdong Basic and Applied Basic Research Foundation (No. 2019A1515011337) and Leading Talent Program of Guangdong Special Projects. The computation part of the work was supported by National Supercomputer Center in Guangzhou, China.

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